Rotary compressor



G. B. PETSCHE.

ROTARY COMPRESSOR.

APPLICATION FAILED OCT. 6, 1920.

Patented May 31, 1921.

2 SHEEISSHEET A TFQRNE Y G. B. PETSCHE.

ROTARY COMPRESSOR.

APPLICATION FILED OCT. 6. 1920.

Patented May 31, 1921.

2 SHEETSSHEET 2.

v kiwi? g wry/ink --%w a M GUSTAV B. PETSCHE, 0F YONKERS, NEW YORK.

ROTARY COMPRESSOR.

Specification of Letters Patent.

Patented May 31, 1921.

Application filed October 6, 1920. Serial No. 415,147.

To all whom it may concern:

Be it known that I, GUsTAv B. PETsoHE, a citizen of the United States of America, and resident of Yonkers, in the county of Westchester, in the State of New York, have invented a certain new and useful Improvement in Rotary Compressors, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention relates to compressors in which the compressing piston .moves with high speed and with a great number of compressing strokes per minute. More particularly though not exclusively my invention is adapted for use with rotary compressors. The object of my invention is to dispense with delivery valves in such engines while at the same time retaining a high rate of efliciency in compressors of this kind. In general practice a considerable amount of liquid is passed through these compressors together with the gas being compressed. This is generally oil or glycerin though some times, as in the case of condenser pumps, the liquid may consist of water. My invention consists, generally speaking, in so constructing the receiver of the compressor and the delivery ports leading into this receiver that the delivery ports will 'be sealed with the liquid during the intervals between the discharge of gas throu h the delivery port into the receiver and 1 accomplish this by providing in the receiving chamber a liquid retaining chamber which should be of such capacity as to contain, above the delivery ports, a body of liquid of greater amount than will flow through the ports in a reversed direction during the periods when the pressure on the compressor side of the ports is less than that in the receiver. In connection with such a receptacle I give the delivery ports leading into it such form and proportion that while they will pass the compressed gas into the receiver at high speed they will ofl'er considerable resistance to the backward How of liquid.

My invention will be best understood as described in connection with the drawings in which it is illustrated and in which- Figure 1 is a side elevation of a rotary compressor provided with my improvement and taken on the section lines 1 1 of Fig. v2.

Fig. 2 is a front elevation taken partly on the section line 2--2 of Fig. 1.

construction of F 3 is a detail.

F1g. 4 is an enlarged detail view of a device for properly forming a delivery port so that it will pass the gas freely to-the receiver and offer resistance to the back flow of oil or liquid into the compressor. This view indicating the flow of gas through this pof t to the receiver.

1g. 5 is a similar view illustratin the back flow of oil. g

F ig, 6 is a view indicating a modified c011- structlon.

Fig. 7, a view illustrating still another modification.

Figs. 8 and 9 fied forms of delivery ports.

Fig. 10 is a view illustrating still another modified construction of delivery port.

Figs. 11 and 12 showing respectively the flow of gas and-back flow of oil in the devices shown in Fig. 10.

Fig. 13 illustrates another form of rotary pump provlded with my improvement, the

new being taken on the line 1313 of Fig.

Fig. 14 isa front view of the pump shown in Fig. 13 partly in section on the line l4.14 of Fig. 13, and

Fig. 15 is an enlarged view showing the and A, Fig. 2, indicate the cylinder of twin pumps formed in the same casting, A and A being the face plates. B indicates the cylindrical periphery of the pump chamber interrupted at point indicated at B, B to give clearance to the piston extension. C is the, bearing for the swivel block shown in F i s. 1 and 2. D is the admission chamber, the delivery port of the compressor which in accordance with my invention is made restricted and of such a form as to pass the compressed gases readily and at high speed while ofi'ering resistance tothe back flow of oil. As shown in Figs. 1 and 3 and the enlarged views, Figs. 4 and 5, the port passage has inserted in it the cylindrical plug indicated at K in which is formed atapered slot indicated at K, the slot tapering toward the receiving chamber of the compressor. As shown in Fig. 6 the delivery portfis forked and has two slotted located in the two branches of,

plugs K, K, the port while slotted plugs tandem.

as shownin Fig. 1,7, two are inserted in'the in are views illustrating modi-- delivery port indicated in.

In the construction shown in Fig.

8 the plug E has formed in it three successive tapered slots arranged in tandem as indicated at K K As shown in Fig. 9 the plug K in addition to the tapered slot K is formed with slots indicated at K K which communicate through ports f, f, with the liquid chamber of the receiver. As shown in Fig. 10 the restrictions in the delivery port are formedthrough a segmental plate L having formed through it more or less numerous and tapered circular passages indicated at L.

F in Fig. 1 indicates the delivery chamber of the compressor which is formed so as to include at its base a liquid containing chamber F of such form and dimensions as to hold a body of liquid generally oil above the delivery port and in suflicient quantity to insure that the port shall be covered by the liquid during the periods between the delivery of compressed gas. indicates the driving shaft of the compressor to which are secured eccentrics indicated at G. On these eccentrics are the eccentric ring pistons H from which extend the slides indicated at I which, as shownin Figs; 1 and 2, have admission passages 1 formed throu h them opening into the cylinder and port 2 so spaced'and proportioned that the port will be closed by the face of the swivel block indicated at J at the top of the stroke.

of the piston. V

In the construction shown in Figs. 13 and 14 1 have illustrated a form of rotary compressor which is, generally speaking, equivalent for the form shown in Figs. 1 and 2. In place of having a eccentric ring piston sliding in a swivel block the piston is provided with an extension indicated at i which is articulated at N to a lever arm M pivoted at M in the center of a segmental bearing indicated at 0 the lever carrying the slide or slides working in this bearing, such a slide being indicated at O and also, either separate from or as a part of this slide, an admission valve indicated at P working with an admission port Q formed in the bearing 0 and in connection with the admission chamber (i. llhe delivery ports here shown as two in number are indicated at e, e, and the restrictions are formed by two segments indicated at L, lb, and generally similar to those shown in Figs. 10, 11 and 12 except that they are here shown as held in position by bolts indicated at r screwing into the inner portion of the casing while in Fig. 10 they are held in position by bolts R screwing through the outer portion of the casing.

In operation the gas to be compressed together with a considerable quantity of oil enters the compressor through the admission port until the compression chamber is fully charged at which point the admission port is closed. The construction shown in Figs. 1

Y the points B and B surface at B stricted port E passing ably slide extension on theand 2 by the passage of the port 1 upward beyond the edge of the swivel block J and in the construction shown in Fig. 13 by the passage of the slide valve P over the port Q after the piston has passed the gas between and comes in contact with the left hand side of the cylinder The admission valve is'again opened to admit fresh charge of gas for compression. As soon as the pressure in the compressor exceeds that in the receiver the compressed gas is delivered through the refor the most part with great velocity through the restricted ports, the velocity, however, diminishing as the plunger approaches the port so that at the end of the compression cycle when probnone or but littlegas remains in the compression cylinder the oil is forced through the delivery port at moderate speed.

The oil passing throu h the delivery port keeps the oil and liquid holding chamber F substantially full of oil so that as soon as the piston has passed the delivery port this oil will begin to flow back through the delivery port but owingto the restricted nature of the port and the non-com ressible quality of the liquid the backward ow will be gradual and will not have time to acquire much velocity before the sor will again exceed thatin the receiver and the flow is reversed as already described.

lln the specific form of compressorshown in Figs. 1 and 13 if have illustrated novel features of construction which are described and claimed in my co-pending applications filed September 25, 1920, and October 6, 1920, Serial Nos. 412,822 and 415,128, and are therefore not specifically claimed in this application except in so combinations with my novel construction of delivery. ports.

Having now described my inventiomwhat 1 claim as new and desire to secure by Letter Patent, is:

1. In combination with a compressor a delivery chamber, a. liquid retaining chamber in said delivery chamber and one or more restricted valveless delivery ports opening from the compressor cylinder into said liquid retaining chamber said ports being so proportioned that while they will permit the compressed gas to pass through them into the receiver at high speed they will offer high resistance to a back gt liquid from the liquid containing cham- 2. In combination with a compressor a delivery chamber, a liquid retaining chamber in said delivery chamber said liquid chamber having such capacity as to retain above the delivery ports opening into it, a body of liquid greater in quantity than will flow backward through the delivery ports during pressure in the compresfar as they form n the interval between delivery flows thereits through and one or more restricted valveless delivery ports opening from the compressor cylinder into said liquid retaining chambers said ports being of such formation that while they will permit the compressed gas to pass through them at high speed they will offer high resistance to a back flow of liquid from the liquid containing chamber.

3. In combination with a rotary compressor a delivery chamber, a liquid retaining chamber in said delivery chamber and one or more restricted valveless delivery ports opening into the liquid retaining chamber said ports being so proportioned that while they will permit the compressed gas to pass through them at high speed they will offer high,res1stance to a back flow of liquid from the receiving chamber.

4:. In combination with a rotary. compressor having a rotating eccentric ring piston provided with an extension serving as a partition between the admission and dellvery ports, a receiving chamber, a liquid retaining chamber in said receiving chambar and one or more restricted valveless delivery ports opening into the liquid retaining chamber said ports being, so proportioned that while they will permit the compressed gas to pass through them at high speed they will oiferhigh resistance to a back flow of liquid from the receiving chamber, an admission port leading into the compressor and means acting to close said admission port during the period when the piston is out of contact with its cylinder.

GUSTAV B. PETSCHE. 

